http://sourceware.org/ml/gdb-patches/2011-02/msg00675.html
Subject: [patch 3/3] Display core reasons even during thread error

[ rediff ]

Hi,

this is mostly unrelated.  But after the patch 2/3 it will still FAIL:
	Loaded symbols for /lib64/ld-linux-x86-64.so.2
	Cannot find new threads: debugger service failed
	(gdb) FAIL: gdb.threads/gcore-thread.exp: re-load generated corefile

as it is a common bug I dislike for years I have fixed it here:
	Loaded symbols for /lib64/ld-linux-x86-64.so.2
	Cannot find new threads: debugger service failed
	Core was generated by `.../gdb/testsuite/gdb.threads/gcore-thread'.
	Program terminated with signal 5, Trace/breakpoint trap.
	#0  thread2 (arg=0xdeadbeef) at ./gdb.threads/pthreads.c:91
	91        int k = 0;
	(gdb) PASS: gdb.threads/gcore-thread.exp: re-load generated corefile

No regressions on {x86_64,x86_64-m32,i686}-fedora15-linux-gnu.


Thanks,
Jan


gdb/
2011-02-24  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* corelow.c: Include wrapper.h.
	(core_open): Call now gdb_target_find_new_threads.
	* wrapper.c: Include target.h.
	(gdb_target_find_new_threads): New.
	* wrapper.h (gdb_target_find_new_threads): New declaration.

--- a/gdb/corelow.c
+++ b/gdb/corelow.c
@@ -47,6 +47,7 @@
 #include "auxv.h"
 #include "elf/common.h"
 #include "gdbcmd.h"
+#include "wrapper.h"
 
 
 #ifndef O_LARGEFILE
@@ -428,7 +429,7 @@ core_open (char *filename, int from_tty)
      may be a thread_stratum target loaded on top of target core by
      now.  The layer above should claim threads found in the BFD
      sections.  */
-  target_find_new_threads ();
+  gdb_target_find_new_threads ();
 
   p = bfd_core_file_failing_command (core_bfd);
   if (p)
--- a/gdb/wrapper.c
+++ b/gdb/wrapper.c
@@ -21,6 +21,7 @@
 #include "exceptions.h"
 #include "wrapper.h"
 #include "ui-out.h"
+#include "target.h"
 
 int
 gdb_parse_exp_1 (char **stringptr, struct block *block, int comma,
@@ -161,3 +162,24 @@ gdb_value_struct_elt (struct ui_out *uiout, struct value **result,
     return GDB_RC_FAIL;
   return GDB_RC_OK;
 }
+
+/* Call target_find_new_threads without throwing exception.  Exception is
+   printed if it got thrown.  */
+
+int
+gdb_target_find_new_threads (void)
+{
+  volatile struct gdb_exception except;
+
+  TRY_CATCH (except, RETURN_MASK_ERROR)
+    {
+      target_find_new_threads ();
+    }
+
+  if (except.reason < 0)
+    {
+      exception_print (gdb_stderr, except);
+      return 0;
+    }
+  return 1;
+}
--- a/gdb/wrapper.h
+++ b/gdb/wrapper.h
@@ -48,4 +48,6 @@ extern int gdb_value_ind (struct value *val, struct value ** rval);
 
 extern int gdb_parse_and_eval_type (char *, int, struct type **);
 
+extern int gdb_target_find_new_threads (void);
+
 #endif /* wrapper.h */